#include "../common/channel.hpp"
#include "../common/etcd.hpp"
#include "main.pb.h"
#include <gflags/gflags.h>
#include <thread>

DEFINE_bool( run_mode, false, "程序的运行模式，false-调试； true-发布；" );
DEFINE_string( log_file, "", "发布模式下，用于指定日志的输出文件" );
DEFINE_int32( log_level, 0, "发布模式下，用于指定日志输出等级" );

DEFINE_string( etcd_host, "http://127.0.0.1:2379", "服务注册中心地址" );
DEFINE_string( base_service, "/service", "服务监控根目录" );
DEFINE_string( call_service, "/service/echo", "服务监控根目录" );

/**
 *      A[启动程序] --> B[解析命令行参数]
        B --> C[初始化日志系统]
        C --> D[创建ServiceManager]
        D --> E[声明服务路径]
        D --> F[绑定服务上下线回调]
        F --> G[创建Discovery对象]
        G --> H[监听ETCD目录变化]
        H --> I[触发回调更新服务状态]
 */

int main( int argc, char *argv[] )
{
    google::ParseCommandLineFlags( &argc, &argv, true );
    init_logger( FLAGS_run_mode, FLAGS_log_file, FLAGS_log_level );

    // 1. 先构造Rpc信道管理对象
    auto sm = std::make_shared<ServiceManager>();
    sm->declared( FLAGS_call_service );
    auto put_cb = std::bind( &ServiceManager::onServiceOnline, sm.get(),
                             std::placeholders::_1, std::placeholders::_2 );
    auto del_cb = std::bind( &ServiceManager::onServiceOffline, sm.get(),
                             std::placeholders::_1, std::placeholders::_2 );
    // 2. 构造服务发现对象
    Discovery::ptr dclient = std::make_shared<Discovery>(
        FLAGS_etcd_host, FLAGS_base_service, put_cb, del_cb );

    while ( 1 )
    {
        // 3. 通过Rpc信道管理对象，获取提供Echo服务的信道
        auto channel = sm->choose( FLAGS_call_service );
        if ( !channel )
        {
            std::this_thread::sleep_for( std::chrono::seconds( 1 ) );
            return -1;
        }
        // 4. 发起EchoRpc调用
        example::EchoService_Stub stub( channel.get() );
        example::EchoRequest req;
        req.set_message( "你好~kenziii~！" );
        brpc::Controller *cntl = new brpc::Controller();
        example::EchoResponse *rsp = new example::EchoResponse();
        stub.Echo( cntl, &req, rsp, nullptr );
        if ( cntl->Failed() == true )
        {
            std::cout << "Rpc调用失败：" << cntl->ErrorText() << std::endl;
            delete cntl;
            delete rsp;
            std::this_thread::sleep_for( std::chrono::seconds( 1 ) );
            continue;
        }
        std::cout << "收到响应: " << rsp->message() << std::endl;
        std::this_thread::sleep_for( std::chrono::seconds( 1 ) );
    }
    return 0;
}